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Just in case, note that the OP specified sendemail, not sendmail. Perhaps it's a typo, but there is such a program and it is available via ubuntu's package repositories.
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sendmail can also receive mail. It must run as a service/daemon and listen to port 25(smtp) at all network interfaces.
It usually comes with mail.local that creates Unix mailbox files.

sendmail is a MTA (Mail Transfer Agent). You need a MDA (Mail Delivery Agent) to handle incoming email. An MDA accepts mail from an MTA and performs the actual delivery to a user's mailbox. A user...

Did you look into the fetchmail package?

They will have checked and repaired themselves. It can tell, because it leaves a flag for itself to check whether the filesystem was unmounted safely or not. Your system would refuse to boot if it...

The system at reboot will have done so (fsck that is ) ... If you have looked at the syslogs, you may have seen messages about abrupt shutdown and so expected flags on the filesystems arent so the...

Yes, there is a very remote chance of that having happened, but it is not at all likely.

Most Unix systems today use a "journaling filesystem" of some sort or other and these are quite robust when...

SVR4 is a very old release (1980's) and it's not going to work very well with modern hardware. It is a 32 bit OS and 40 GB is probably more than it can handle. Try giving it a 1 GB partition or a...